Textbook of Botany for Colleges and Universities, Part 1

A Textbook of Botany for Colleges and Universities; Volume 2

Preliminary Revision of the North American Species of Echinocactus, Cereus, and Opuntia; Volume 3

Morphology of Angiosperms

Fundamentals of Plant-Breeding

Morphology of Gymnosperms

Morphology of Angiosperms : (Morphology of Spermatophytes. Part Ii)

Botany of Western Texas

Evolution of Sex in Plants

Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora

The Evolution of Sex in Plants